Ok, here's what it looks like using mostly O54 switches and curves. I played with the upper spur to lower the grade for the inner mainline. I stayed with the 6" elevation, the flat left side of the inner mainline and added a passing siding back in. All the changes are on separate layers, so you can turn the old ones on to compare. Mare can be done with the upper bench work after the bridge to smooth the curves, etc. There's also a transparent polygon around the bench work so you can see the elevated track in 3D view. When you compare each layer to its counterpart, you'll see there's not much difference. I didn't think to put the grade labels on separate layers, so you'll have to refer to the other jpg photo.
